Cointegration Tool

A simple web based tool is required that will calculate cointegration values for two stocks. This is to be done for several time periods - 12 months, 6 months, 3 months, 1 month, 2 weeks, 1 week. The results to be displayed in a table. Data is to be sourced from Yahoo. Bidders will only be considered if they have statistics knowledge and show some demonstrated experience in programming. Demonstrated experience means that I need to see some functioning script that you have done. A link to a site where the script is running is ok.